Go to Montero Sport On Line DIY you will find instructions as well as photograps of the steps to take to do it yourself. The Wires depnding on Manufacturer are about $50.00. the Plugs $4.49 A piece (Total $28.55 with 6 % tax) total $78.55 if you DIY. If you take it to a Mitsubishi Dealer you are looking at $259.00 if you supply the parts.